CERN Accelerating science

All CERN Accelerators documents

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2019-09-20
15:18
Single-sided collimation and the effects on beam cleaning and impedance in the LHC / Kodjaandreev, Dimitr Petkov (University of Malta (MT))
The Large Hadron Collider (LHC) employs a multistage collimation system to protect against unavoidable beam losses during operation. A regular collimator consists of two movable blocks placed symmetrically around the circulating beam in order to intercept halo particles. [...]
CERN-THESIS-2019-128.- 160 p. Fulltext: PDF; External link: Approve this document (restricted)

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2019-09-20
13:36
TT20 beam loss reduction / Tat, Duy-Martin (University of Oxford)
The beam losses at the TT20 beam splitter are studied and different schemes for reducing these losses are performed. [...]
CERN-STUDENTS-Note-2019-219.
- 2019.
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2019-09-20
08:41
The ATLAS multi-user upgrade and potential applications / Mustapha, B (Argonne, PHY) ; Nolen, J A (Argonne, PHY) ; Savard, G (Argonne, PHY) ; Ostroumov, P N (Michigan State U., East Lansing (main))
With the recent integration of the CARIBU-EBIS charge breeder into the ATLAS accelerator system to provide for more pure and efficient charge breeding of radioactive beams, a multi-user upgrade of the ATLAS facility is being proposed to serve multiple users simultaneously. ATLAS was the first superconducting ion linac in the world and is the US DOE low-energy Nuclear Physics National User Facility. [...]
2017 - 11 p. - Published in : JINST 12 (2017) T12002

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2019-09-19
16:25
A VdM Sequence File Web Application / Hickman, Thomas Kendall ; Marqversen, Frederik Kofoed ; Calia, Andrea (CERN) ; Hostettler, Michi (CERN)
To perform Van der Meer scans at the LHC, the experimental collaborations have to supply a text file containing a command sequence specifying the beam positions required. [...]
CERN-ACC-NOTE-2019-0038.
- 2019.

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2019-09-19
11:31
Studies of PACMAN effects in the HL-LHC / Ribes Metidieri, Ariadna (University of Barcelona (ES)) ; Buffat, Xavier (CERN)
This note summarises the status of the studies on PACMAN beam-beam effects in the HL-LHC project. [...]
CERN-ACC-NOTE-2019-0037.
- 2019. - 34 p.

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2019-09-19
09:30
A VdM Sequence File Web Application (report) / Marqversen, Frederik Kofoed ; Hickman, Thomas Kendall
To perform Van der Meer scans at the LHC, the experimental collaborations have to supply a text file containing a command sequence specifying the beam positions required. [...]
CERN-STUDENTS-Note-2019-210.
- 2019.
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2019-09-18
06:48
Producing multi-coloured bunches through beam-induced ionization injection in plasma wakefield accelerator / Vafaei-Najafabadi, N (Stony Brook U.) ; Amorim, L D (Stony Brook U.) ; Adli, E (Oslo U.) ; An, W (UCLA) ; Clarke, C I (SLAC) ; Clayton, C E (UCLA) ; Corde, S (Palaiseau, Lab. Opt. Appl.) ; Gessner, S (CERN) ; Green, S Z (SLAC) ; Hogan, M J (SLAC) et al.
This paper discusses the properties of electron beams formed in plasma wakefield accelerators through ionization injection. In particular, the potential for generating a beam composed of co-located multi-colour beamlets is demonstrated in the case where the ionization is initiated by the evolving charge field of the drive beam itself. [...]
2019 - Published in : Philos. Trans. R. Soc. Lond. A 377 (2019) 20180184
In : Directions in particle beam-driven plasma wakefield acceleration : Theo Murphy meeting, Newport Pagnell, Buckinghamshire, UK, 4 - 5 Jun 2019, pp.20180184

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2019-09-18
06:48
Betatron radiation and emittance growth in plasma wakefield accelerators / San Miguel Claveria, P (Palaiseau, Lab. Opt. Appl.) ; Adli, E (Oslo U.) ; Amorim, L D (Stony Brook U.) ; An, W (UCLA) ; Clayton, C E (UCLA) ; Corde, S (Palaiseau, Lab. Opt. Appl.) ; Gessner, S (CERN) ; Hogan, M J (SLAC) ; Joshi, C (UCLA) ; Kononenko, O (Palaiseau, Lab. Opt. Appl.) et al.
Beam-driven plasma wakefield acceleration (PWFA) has demonstrated significant progress during the past two decades of research. The new Facility for Advanced Accelerator Experimental Tests (FACET) II, currently under construction, will provide 10 GeV electron beams with unprecedented parameters for the next generation of PWFA experiments. [...]
2019 - 9 p. - Published in : Philos. Trans. R. Soc. Lond. A 377 (2019) 20180173 Fulltext from publisher: PDF;
In : Directions in particle beam-driven plasma wakefield acceleration : Theo Murphy meeting, Newport Pagnell, Buckinghamshire, UK, 4 - 5 Jun 2019, pp.20180173

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2019-09-17
07:01
Dynamic Response of Advanced Materials Impacted by Particle Beams: The MultiMat Experiment / Pasquali, M (CERN) ; Bertarelli, A (CERN) ; Accettura, C (CERN ; Milan Polytechnic) ; Berthome, E (CERN) ; Bianchi, L (CERN) ; Bolz, P (Darmstadt, GSI) ; Carra, F (CERN) ; Fichera, C (BIAM, St Paul lez Durance) ; Frankl, M I (CERN) ; Furness, T (Huddersfield U.) et al.
The introduction at CERN of new extremely energetic particle accelerators, such as the high-luminosity large hadron collider (HL-LHC) or the proposed future circular collider (FCC), will increase the energy stored in the circulating particle beams by almost a factor of two (from 360 to 680 MJ) and of more than 20 (up to 8500 MJ), respectively. In this scenario, it is paramount to assess the dynamic thermomechanical response of materials presently used, or being developed for future use, in beam intercepting devices (such as collimators, targets, dumps, absorbers, spoilers, windows, etc.) exposed to potentially destructive events caused by the impact of energetic particle beams. [...]
publ - 30 p. - Published in : Journal of Dynamic Behavior of Materials 5 (2019) 266-295 External link: Fulltext from publisher

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2019-09-17
07:01
Commissioning of a beam screen test bench experiment with a future circular hadron collider type synchrotron radiation beam / Gonzalez, L A (CERN ; Frascati) ; Gil-Costa, M (Madrid, CIEMAT ; CERN) ; Baglin, V (CERN) ; Chiggiato, P (CERN) ; Garion, C (CERN) ; Kersevan, R (CERN) ; Casalbuoni, S (KIT, Karlsruhe) ; Huttel, E (KIT, Karlsruhe) ; Bellafont, I (CELLS - ALBA, LLS) ; Perez, F (CELLS - ALBA, LLS)
Coping with synchrotron radiation (SR) that originated at superconducting bending magnets is one of the major challenges in the design of the vacuum beam pipes of hadron colliders. In the case of the Future Circular hadron Collider (FCC-hh), similarly as for the LHC, a beam screen, operating at higher temperatures than the cold mass, has been designed in order to preserve the superconducting magnet cold bores from direct synchrotron irradiation. [...]
2019 - 12 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 083201 Fulltext from publisher: PDF;

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